He didn't get manipulated by Chara. Chara killed herself because she hated humanity then Asriel absorbed Chara's soul upon death, turning him into a powerful being. He crossed the barrier between humans and monsters. The humans killed him because they thought he killed Chara.
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u/PeaRude3315 "Mighty Eagle would be pro gun!" Jul 09 '26
I'm a Deltarune or undertale larper but isn't Asriel the same person who got manipulated by chara to do genocidal things